Im gonna go with the NZXT GAMMA. This thing is a beast for 30 dollars.

Will I have any trouble installing a Corsair H70 CPU Cooler in it, in terms of the back plate installation?

As said above me, it'll fit fine. It's roomier than the pictures give it credit for. If you ever switch to a taller heatsink, it'll be a tight squeeze for one of the side panel fans. I have the 212 and I'm not brave enough to try it.